Improve CI

[kevalmorabia97]

• Merge multiple CI workflows into one
• Run tests only if DCO is passed
• Add codecov.yml to allow upto 5% drop in unit test coverage per PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.68%. Comparing base (add6912) to head (660c3d9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #249   +/-   ##
=======================================
  Coverage   73.68%   73.68%           
=======================================
  Files         175      175           
  Lines       17026    17026           
=======================================
  Hits        12545    12545           
  Misses       4481     4481           

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